van Gogh and Mozart died paupers. Their genius was recognized posthumously, regardless of the time involved with their creations. The taste in art may change again, and the subjective value of those works may also. Art is not currency. These works will not stand the test of time. The last Supper in nearly gone because it wasn't painted fresco. You are comparing apples and oranges, IMO.
Historically, the value of gold has been nearly constant, not subjective. In Roman times, an ounce of gold would buy and a good suit of clothes, a good pair of shoes, and a good meal. The same is true today. The labor involved makes a product that will last essentially forever and that has inherit value, independent of time, countries, governments, and people's tastes. I'll learn about Marx's labor 'theory,' but you should also learn about this history of gold and value-based currencies. Thanks for that link.
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